A large container ship shaft system lifting tool and installation method

Abstract

The present application relates to the field of shipbuilding technology, and is a large container ship shaft system lifting tool and installation method. The shaft system includes a propeller shaft and an intermediate shaft. A single-track I-beam for shaft movement is set in the center of the hull above each intermediate shaft. A double-track I-beam is set below each intermediate shaft. A double-track trolley for shaft movement is installed on the double-track I-beam. Three hand-pulled monorail trolleys are suspended below the single-track I-beam. There is a lifting beam below each hand-pulled monorail trolley, which is used to insert the 1# intermediate shaft into the shaft belt generator during subsequent operations. The lifting beam of the hand-pulled monorail trolley and the lifting points for movement of each shaft are equipped with a pneumatic hoist for lifting. The pneumatic hoist, lifting point, lifting belt, lifting beam and trolley set in the shaft lifting process of the present application realize the convenience of shaft system lifting. The in-situ up and down, left and right movement of any shaft only requires 2 people to operate without much physical exertion. During the entire operation, the professional shaft system lifting team only needs 5 people, realizing the multi-person operation of large container ship shaft system lifting.

Description

Technical Field

[0001] The present application relates to the field of shipbuilding technology, and in particular to a large container ship shaft system lifting tool and an installation method. Background Art

[0002] Large container ships are typically designed with multiple shafts, including one propeller shaft and two or three intermediate shafts. The latest container ships are also equipped with shaft-mounted permanent magnet rotor generators (hereinafter referred to as shaft generators). The shaft generator's rotor is a permanent magnet and is encircled by an intermediate shaft (rotor shaft) closest to the main engine's output end. When the main engine's crankshaft rotates, the propeller rotates via the drive shaft, thereby propelling the ship and simultaneously driving the generator to output electricity for the ship. The shaft system includes the propeller shaft, intermediate shaft, shaft generator, main engine, intermediate bearings, and various accessories. The shaft generator, as part of the shaft system, is mounted on an intermediate shaft connected to the main engine's flywheel. The main engine is connected to the drive shaft that drives the propeller via the intermediate shaft. The intermediate shaft is connected to the permanent magnet generator rotor flange via a flange protruding from the middle of the intermediate shaft. The permanent magnet generator's stator is fixed to the permanent magnet generator's housing, which is secured to the hull via the engine base. How to formulate a reasonable shafting lifting plan based on the shafting arrangement and hull structural characteristics, including overall considerations in the initial design stage, optimization in the detailed design stage, and comprehensive consideration of minimizing the docking period, so as to achieve flexibility in shafting arrangement, simplification of lifting operations, and minimization of overall costs is a goal that shipyard technicians need to consider from the perspective of lean production. Summary of the Invention

[0003] In order to shorten the operation time of the shafting system of large container ships under the traditional mode, the present application provides a large container ship shafting system lifting tooling and installation method. During the shipbuilding process, the installation of the shafting system generally needs to be moved into the shaft room through the opening position where the main engine is located before the main engine is installed, and the cabin top section is installed after the main engine is installed. Under the traditional mode, the shafting system is first formally illuminated, the installation of the shafting system is completed before the main engine is installed, and the cabin top section is installed after the main engine is installed. The time from the temporary illumination of the shafting system to the installation of the main engine is too long, which affects the shipbuilding cycle. The purpose of the present invention is to shorten the operation time of the shafting system of large container ships under the traditional mode, and adopt a large container ship shafting system lifting and installation method that completes the pre-loading of multiple shafts of the large and long shafting system of large container ships before the main engine is installed, and adopts the following technical solutions:

[0004] A large container ship shaft system lifting tooling, the shaft system includes a propeller shaft, a No. 1 intermediate shaft, a No. 2 intermediate shaft and a No. 3 intermediate shaft, wherein the propeller shaft and the No. 1 intermediate shaft are arranged in the center, and the No. 2 intermediate shaft and the No. 3 intermediate shaft are arranged on both sides; a single-track I-beam for shaft movement is arranged in the center of the hull above each intermediate shaft, and a double-track I-beam is arranged below each intermediate shaft, and a double-track trolley for shaft movement is arranged on the double-track I-beam; three hand-pulled monorail trolleys are suspended below the single-track I-beam, and a lifting beam is installed below the hand-pulled monorail trolleys for inserting the No. 1 intermediate shaft into the shaft-belt generator during subsequent operations; pneumatic hoists for lifting are provided at the lifting beam of the hand-pulled monorail trolley and the lifting points for movement of each shaft; each lifting point on the shaft is provided with two pneumatic hoists through an annular lifting belt, and a single shaft can be lifted simultaneously by at least four pneumatic hoists.

[0005] Preferably, the lifting capacity requirement of the pneumatic hoist is 1 / 4 of the axle weight. By adopting the above technical solution, the external dimensions of the pneumatic hoist can be reduced accordingly to adapt to the narrow space requirements of the ship.

[0006] Preferably, backup lifting points are provided in addition to the pneumatic hoist lifting points, along with dedicated lifting straps. The length of the lifting straps is calculated based on the height at which the shaft is suspended. When a single shaft is suspended for a long period of time, a total of eight lifting points simultaneously support the shaft's weight, with a single lifting point bearing 1 / 8 of the shaft's weight. By adopting the above technical solution, considering the risk of slippage when the shaft is used as a heavy object in a pneumatic hoist for a long period of time, backup lifting points are provided in addition to the pneumatic hoist lifting points, thereby improving safety.

[0007] Preferably, the propeller shaft and the 1# intermediate shaft are arranged in the center, and the 2# intermediate shaft and the 3# intermediate shaft are arranged on both sides. The lower end of the propeller shaft and the 1# intermediate shaft flange can be lifted by a pneumatic hoist to be 500mm above the axis without affecting the illumination of the axis. After the propeller shaft and each intermediate shaft are temporarily suspended in the shaft chamber, the main engine can be hoisted and loaded.

[0008] Preferably, the propeller shaft and each intermediate shaft are temporarily suspended at the suspension points in the shaft chamber and the stress conditions thereof are calculated to determine the form of the structural lifting lugs and to add corresponding reinforcement strips.

[0009] Preferably, the form of the structural lifting lugs and the arrangement of the corresponding additional reinforcement strips are included in the management of the hull structure production design drawings before the start of section construction. If there is interference with other hull components or pipelines and circuits, coordination with relevant professionals is required before the production design drawings are issued to ensure that the lifting lugs are permanently retained as part of the hull and do not need to be cut off after the operation is completed.

[0010] A method for hoisting and installing a shaft system of a large container ship comprises the following steps:

[0011] Step 1: Two high-strength circular slings of suitable lifting weight are tied equidistantly on both sides of the propeller shaft's center of gravity by threading and bundling. The slings are then hung on the hook of the dock gantry crane to lift the propeller shaft into the engine room.

[0012] Step 2: A support platform and sleepers are provided on the inner bottom of the main engine platform; the propeller shaft passes through two hand-pulled monorail trolleys with hanging beams toward one end of the shaft chamber, and the high-strength annular sling is wrapped around the propeller shaft in the form of a bag. While operating the dock crane to continue to descend, the pneumatic hoist on the hand-pulled monorail trolley (2 at each location) is operated to move upward so that the hand-pulled monorail trolley, hanging beam, pneumatic hoist, and sling assembly begin to be stressed; until the weight of the propeller shaft is completely borne by the hand-pulled monorail trolley and the support platform; then the hook continues to descend to release the sling that binds the shaft, and then the hook moves forward to near the front flange, and the sling bag is hung around the propeller shaft to bear the stress; then the pneumatic hoist and the hook move upward at the same time to lift the propeller shaft a short distance, and then the sleepers are removed to facilitate the propeller shaft flange to pass through the support platform, and the monorail trolley and the dock crane are operated to move backward at the same time until the lifting point at the front flange can no longer move backward;

[0013] Step 3: When the dock crane cannot move further backward, a high-strength ring sling is placed around the propeller shaft in a sling-like manner. Two pneumatic hoists are operated to move upward, so that the third hand-pulled monorail trolley located at the front of the monorail I-beam bears the weight of the propeller shaft through the sling beam. The hook of the dock crane then continues to descend and leaves.

[0014] Step 4: Move the lifting point consisting of the middle trolley, lifting beam, pneumatic hoist (2 units in total), and high-strength ring sling forward to a position close to the center of gravity of the propeller shaft. Then, operate the three sets of hand-pulled monorail trolleys to share the weight of the propeller shaft. Then, operate the three sets of hand-pulled monorail trolleys to move backward simultaneously to above the two double-track trolleys located on the double-track I-beam.

[0015] Step 5: Use pneumatic hoists (a total of 6 units) to lower the propeller shaft onto the two double-track trolleys on the double-track I-beam. The propeller shaft is moved backward to the designated position by the double-track trolleys. The remaining intermediate shafts can be moved to the designated positions in the same way as described in the above steps.

[0016] Step 6: Use a lifting point equipped with pneumatic hoists (a total of 4 units) to lift the 2# and 3# intermediate shafts to the specified height using a high-strength circular sling. Then, use a customized high-strength circular sling to hold the 2# and 3# intermediate shafts at the lifting point. Then, use a pneumatic hoist (a total of 4 units) to lower the 2# and 3# intermediate shafts so that the slings at the lifting point are stressed. This ensures that the slings and pneumatic hoists at the lifting point are roughly evenly stressed, increasing the safety redundancy of the lifting point. The shafts are temporarily placed at a height that ensures that the flanges are higher than the shaft system height to facilitate subsequent axis lighting operations.

[0017] Step 7: Use the pneumatic hoists and slings installed at the central and port sides of the sling points and pull them in pairs to move the 2# and 3# intermediate shafts from the central position to the port and starboard positions for suspension. Then, use the slings and pneumatic hoists as in Step 6 to roughly evenly support the weight of the 2# and 3# intermediate shafts, thereby increasing the safety redundancy of the sling points.

[0018] Step 8: After temporarily suspending intermediate shafts 2 and 3, move intermediate shaft 1 to the designated location according to steps 2 to 5. Use the lifting points, the pneumatic hoist on the hand-pulled monorail trolley, and the lifting straps to roughly evenly support the weight of intermediate shaft 1, increasing the safety redundancy of the lifting points.

[0019] Step 9: During formal installation, the propeller shaft can be lifted a short distance upwards using a pneumatic hoist to release the force on the lifting point and the high-strength annular sling below. The sling can then be removed. The weight of the propeller shaft is now entirely borne by the lifting point, the pneumatic hoists (a total of four units), and the high-strength annular sling. Operate the pneumatic hoists (a total of four units) to lower the propeller shaft onto the double-track trolley located on the double-track I-beam. The weight of the propeller shaft is entirely borne by the double-track trolley. The propeller shaft surface can then be degreased and cleaned.

[0020] Preferably, the degreasing and cleaning operation can utilize the up and down movement of the pneumatic hoist (a total of 4 units), the forward and backward movement of the double-track trolley, and the operation of the pneumatic hoist to raise one side and lower the other side to realize the rotation of the shaft through the strength ring sling, which is convenient for degreasing and cleaning the large-diameter propeller shaft.

[0021] Step 10: Use the double-track trolley on the double-track I-beam to help adjust the propeller shaft's height and left-right position to facilitate alignment before inserting the propeller shaft into the stern tube bearing.

[0022] Step 11: Using the compact pulley device installed on the end face of the stern tube and the shaft movement force anchor point on the bearing platform, fix one end of the shaft movement traction wire rope sling to the flange of the propeller shaft, and then change the direction of the other end through the compact pulley device and connect it to the force anchor point through the shaft movement pneumatic hoist;

[0023] Step 12: Operate the pneumatic hoist to pull the traction wire rope to move the propeller shaft and complete the operation of inserting the propeller shaft into the shaft tube.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. During the shaft movement and lifting process, this application utilizes a pneumatic hoist, lifting points, lifting belts, and a monorail pulley with a lifting beam to facilitate shaft lifting and reduce the number of people involved. Only two people are needed to move any shaft up and down, or left and right, without significant physical exertion. The entire operation requires only five people in the professional shaft lifting team, achieving a labor-saving operation for large container ship shaft lifting.

[0026] 2. This application takes into account the overall considerations in the initial design stage, optimization in the detailed design stage, and comprehensive consideration of minimizing the docking period, thereby achieving the lean production goals of less-manned operation of the shafting system of large container ships, flexibility in shafting arrangement, simplification of operations, and minimization of overall costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a diagram of temporary suspension of the stern shaft and intermediate shaft;

[0028] Figure 2 yes Figure 1 Middle CC cross-section;

[0029] Figure 3 yes Figure 1 Middle DD cross-section;

[0030] Figure 4 yes Figure 1 Middle AA cross-section;

[0031] Figure 5 yes Figure 1 Middle BB cross-section;

[0032] Figure 6 It is a schematic diagram of the construction lug;

[0033] Figure 7 This is a schematic diagram of the shaft being hoisted into the engine room opening;

[0034] Figure 8 It is a schematic diagram of the axle being transported by suspension from a monorail pulley;

[0035] Figure 9 It is a schematic diagram of the axle moving backwards by the double-track trolley;

[0036] Figure 10 This is a schematic diagram of the shaft being suspended by a pneumatic hoist;

[0037] Figure 11 This is a diagram of the suspension with the intermediate shaft moving left and right;

[0038] Figure 12 Schematic diagram of intermediate shaft suspension

[0039] Figure 13 This is a schematic diagram of the 1# intermediate shaft suspension;

[0040] Figure 14 It is a schematic diagram of axis rotation;

[0041] Figure 15 This is a schematic diagram of the stern shaft placed on a double-track trolley;

[0042] Figure 16 This is a schematic diagram of the stern shaft being inserted into the shaft tube;

[0043] Figure 17 This is a top view of the stern shaft inserted into the shaft tube;

[0044] Figure 18 This is a flow chart of the installation of the shafting during the shipbuilding process in the prior art;

[0045] Figure 19 This is a flow chart of the installation of the shafting during the shipbuilding process in this application.

[0046] Description of reference numerals:

[0047] Host: E00;

[0048] Host: E00;

[0049] Double track I-beam: H2, H3;

[0050] Double-track trolleys: 12, 13, 14;

[0051] Hand-pulled monorail trolleys: 15, 16, 17;

[0052] Hanging beams: 18, 19, 20;

[0053] Bearing stand: MS4;

[0054] Lifting direction: A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18;

[0055] Support platform: B1;

[0056] Sleepers: B2, B3;

[0057] Hooks: 21;

[0058] D1 / D6: Lifting equipment is arranged on the left and right, including structural lifting lugs and shackles, used for the suspension of the 2# and 3# intermediate shafts and for left and right movement;

[0059] D3 / D4: Lifting equipment is arranged on the left and right, including structural lifting lugs and shackles, for suspending the 2# and 3# intermediate shafts;

[0060] D2 / D5: The lifting equipment is arranged in the center, including structural lifting lugs and shackles, used for hanging and moving up and down the No. 1 intermediate shaft (rotor shaft) and for moving the No. 2 and No. 3 intermediate shafts left and right;

[0061] D8 / D9: The lifting equipment is arranged in the center, including structural lifting lugs and shackles, used for hanging and moving the propeller shaft (tail shaft) up and down;

[0062] D7 / D10: Centrally arranged lifting equipment, including structural lifting lugs and shackles, for propeller shaft (tail shaft) suspension;

[0063] 1-11: Pneumatic hoists for lifting (22 units in total); 15 / 16 / 17: 1#, 2#, 3# hand-pulled monorail trolleys with lifting beams;

[0064] S1-S3: slings for moving the axle forward and backward (on a hand-pulled monorail trolley);

[0065] S4-S5: 1# intermediate shaft suspension and slings for the left and right movement of 2# and 3# intermediate shafts;

[0066] S6 / 7, S8 / 9: 2# intermediate shaft, 3# intermediate shaft suspension and slings for left and right movement;

[0067] S10 / 11, S12 / 13: slings for suspension of 2# intermediate shaft and 3# intermediate shaft;

[0068] S14-S15: tail shaft suspension and sling for up and down movement;

[0069] S16-S17: tail shaft suspension strap;

[0070] D11 / D12: Compact pulley device;

[0071] D13 / D14: axis movement force anchor point;

[0072] S18 / S19: axis moving traction wire rope;

[0073] 21 / 22: Axis moving pneumatic hoist. DETAILED DESCRIPTION

[0074] The following is combined with Figure 1-19 This application is described in further detail.

[0075] Example 1

[0076] The embodiment of the present application discloses a large container ship shaft system lifting tool.

[0077] Reference Figure 18During shipbuilding, the shafting system is typically installed by moving it through the main engine opening into the shaft chamber before the main engine is installed. The nacelle roof sections are then installed after the main engine is installed. Traditionally, the shafting system is first officially illuminated, and the shafting system installation is completed before the main engine is installed. The nacelle roof sections are then installed after the main engine is installed. This delay between the temporary shafting illumination and main engine installation is excessive, significantly impacting the shipbuilding cycle.

[0078] Reference Figure 19 The purpose of the present invention is to shorten the shafting operation time of large container ships in the traditional mode, and to adopt a shafting lifting and installation method in which multiple shafts of the large container ship's long shafting are pre-loaded and hung on the inner wall of the shaft chamber before the main engine is installed.

[0079] Reference Figures 1-6A method for lifting and installing the shaft system of a large container ship includes a lifting tool. The lifting tool includes a single-track I-beam H1 for shaft movement at the center of the hull above the intermediate shafts E11, E12, and E13. At the same time, double-track I-beams H2 and H3 are arranged below the intermediate shafts E11, E12, and E13. Double-track trolleys 12, 13, and 14 for shaft movement are arranged on the double-track I-beams H2 and H3; three hand-pulled monorail trolleys 15 and 16 are suspended below the single-track I-beam H1. Lifting beams 18, 19, and 20 are installed beneath hand-pulled monorail trolleys 15, 16, and 17. These are used to thread intermediate shaft E11 #1 into shaft-driven generator E10 during subsequent operations. Pneumatic hoists are installed at the lifting points of each shaft, along with lifting beams 18, 19, and 20. Each lifting point on the shaft is equipped with two pneumatic hoists via a circular sling. A single shaft can be lifted simultaneously by at least four pneumatic hoists. The lifting capacity of each pneumatic hoist is required to be 1 / 4 of the axle weight. Backup lifting points D3 / D4 and D7 / D10 are located outside the pneumatic hoist lifting points. Special lifting straps S10 / 11, S12 / 13, S14, S15, S18, and S19 are also installed. The length of the lifting straps is calculated based on the shaft suspension height. When a single shaft is suspended permanently, eight lifting points simultaneously support the shaft's weight, with each lifting point supporting 1 / 8 of the shaft's weight. Propeller shaft E14 and No. 1 intermediate shaft E11 are centrally located, while No. 2 intermediate shaft E12 and No. 3 intermediate shaft E13 are positioned on either side. The lowermost flanges of propeller shafts E14 and No. 1 intermediate shaft E11 can be lifted 500mm above the axis using a pneumatic hoist without affecting the axis's illumination. Once the propeller shaft E14 and intermediate shafts E11, E12, and E13 are temporarily suspended in the shaft compartment, the main engine E00 can be hoisted and loaded. The propeller shaft E14 and each intermediate shaft E11, E12, and E13 are temporarily suspended at the shaft housing at points where forces are applied. The design of the structural lifting lugs and the placement of the corresponding reinforcement strips are determined based on the load conditions. The design of the structural lifting lugs and the placement of the corresponding reinforcement strips are incorporated into the hull structure production design drawings before the start of block construction. If there is any interference with other hull components, piping, or circuits, coordination with relevant professionals is required before the production design drawings are issued to ensure that the lifting lugs remain a permanent part of the hull and do not need to be removed after the work is completed.

[0080] Example 2

[0081] This embodiment discloses a method for hoisting and installing a shaft system of a large container ship, comprising the following steps:

[0082] Step 1: Reference Figure 7 , use two ring-shaped high-strength slings S18 & S19 of suitable lifting weight to tie them equidistantly on both sides of the center of gravity of the propeller shaft E14 by penetration and binding, hang them on the hook 21 of the dock gantry crane, and lift the propeller shaft E14 into the A1 cabin;

[0083] Step 2: Reference Figure 7 A support platform B1 and sleepers B2 & B3 are provided on the inner bottom of the mainframe E00; the propeller shaft E14 is directed toward one end of the shaft chamber via two hand-pulled monorail trolleys 16 & 17 with hanging beams 19 & 20, and a high-strength annular sling S2 & S3 is wrapped around the propeller shaft E14 in a slinging manner. The dock crane is operated to continue descending A1 while the pneumatic hoists 5 & 6 on the hand-pulled monorail trolleys 16 & 17 are operated to move upwards A2, two at a time, so that the hand-pulled monorail trolleys 16 & 17, hanging beams 19 & 20, pneumatic hoists 5 & 6, and slings S2 & S3 assembly begin to bear force; until the weight of the propeller shaft E14 is completely borne by the hand-pulled monorail trolleys. The monorail trolleys 16 & 17 and the support platform B1 bear the load; then the hook 21 continues to descend to release the slings S18 & S19 that bind the shaft. The hook 21 then moves forward A3 to near the front flange, hooking the slings S18 & S19 around the propeller shaft E14 to bear the load; then the pneumatic hoists 5 & 6 and the hook 21 move upward simultaneously to lift the propeller shaft E14 a short distance A2, and then the sleepers B2 & B3 are removed A4 so that the flange of the propeller shaft E14 can pass through the support platform B1. The monorail trolleys 16, 17 and the dock crane are operated to move backward simultaneously A5 until the lifting point at the front flange can no longer move backward.

[0084] Step 3: Reference Figure 8 When the dock crane cannot move further backward, the high-strength endless sling S1 is wrapped around the propeller shaft E14 in a slinging manner. The pneumatic hoists 1 (two in total) are operated to move A6 upward, so that the third hand-pulled monorail trolley 15 located at the front of the monorail I-beam H1 bears the weight of the propeller shaft E14 through the lifting beam 18. Then the hook of the dock crane continues to descend and leaves A8.

[0085] Step 4: Reference Figure 8 After the lifting point consisting of the middle trolley 16, the lifting beam 19, the pneumatic hoist 5, and the high-strength ring sling S2 is moved forward A7 to a position close to the center of gravity of the propeller shaft E14, the three sets of manual monorail trolleys 15, 16, and 17 share the weight of the propeller shaft E14. Then, the three sets of manual monorail trolleys 15, 16, and 17 are operated to move backward A9 simultaneously to above the two double-track trolleys 13 and 14 located on the double-track I-beam H3.

[0086] Step 5: Reference Figure 9 , use pneumatic hoists 1, 5, and 6 (a total of 6 units) to lower the propeller shaft E14 to the two double-track trolleys 13 & 14 on the double-track I-beam H3. The propeller shaft E14 is moved backward A11 to the designated position by the double-track trolleys 13 & 14. The remaining intermediate shafts E11, E12, and E13 can be moved to the designated positions in the same way as described in the above steps.

[0087] Step 6: Reference Figure 10 , use the pneumatic hoist 10 & 11 (a total of 4 units) with the lifting point D8 & D9 to lift the 2# intermediate shaft E12 and 3# intermediate shaft E13 to the specified height slightly higher than the S16 & S17 lifting belt through the high-strength ring lifting belt S14 & S15; then use the customized length of the high-strength ring lifting belt S16 & S17 to lift the 2# intermediate shaft E12 and 3# intermediate shaft E13 to A13 at the lifting point D7 and D10, and then use the pneumatic hoist to lift the 2# intermediate shaft E12 and 3# intermediate shaft E13 to A13. Hoists 10 & 11, a total of 4 units, lower the 2# intermediate shaft E12 and 3# intermediate shaft E13 to apply force to the slings S16 & S17 at lifting points D7 & D10. This will ensure that the slings S14, S15, S16, S17 and pneumatic hoists at lifting points D7, D8, D9, and D10 are roughly evenly loaded, increasing the safety redundancy of lifting points D7, D8, D9, and D10. The height of the temporary placement of the shaft ensures that the flange is higher than the height of the shaft system to facilitate subsequent axis lighting operations.

[0088] Step 7: Reference Figure 11-12 , by setting the lifting points at the central position D2&D5 and the port and starboard positions D1&D6 and the pneumatic hoists 4&7, 2&8, 3&9 and slings S4&S5, S6&S8, S7&S9 installed below, and pulling the slings in pairs, the second intermediate shaft E12 and the third intermediate shaft E13 are moved from the central position D2&D5 to the port and starboard positions D1&D6 for suspension. Then, the weight of the second intermediate shaft E12 and the third intermediate shaft E13 is roughly evenly supported by the slings D1, D6, D3, D4 and the pneumatic hoists according to step 6, thereby increasing the safety redundancy of the lifting points;

[0089] Step 8: Reference Figure 1 、 Figure 13 After temporarily suspending intermediate shafts 2# E12 and 3# E13, move intermediate shaft 1# E11 to the designated position according to steps 2 to 5. The weight of intermediate shaft 1# E11 is roughly evenly supported by pneumatic hoists 4, 5, 6, 7, and slings on lifting points D2, D3, D4, and D5, as well as the hand-pulled monorail trolleys 16 and 17, thereby increasing the safety redundancy of the lifting points.

[0090] Step 9: Reference Figure 10During formal installation, the propeller shaft E14 can be lifted a short distance upwards using pneumatic hoists 10 & 11. The load on the lifting points D7 & D10 and the high-strength annular slings S16 & S17 below is released, and the slings S16 & S17 are then removed. The weight of the propeller shaft E14 is now completely borne by the lifting points D8 & D9, the pneumatic hoists 10 & 11 (a total of four units), and the high-strength annular slings S14 & S15. Operate the pneumatic hoists 10 & 11 (a total of four units) to lower the propeller shaft E14 to the position on the double-track I-beam. On the double-track trolleys 13 & 14 on H3, the weight of the propeller shaft E14 is completely borne by the double-track trolleys 13 & 14, and then the surface of the propeller shaft E14 is degreased and cleaned. The degreasing and cleaning operation can utilize the up and down movement of the pneumatic hoists 10 & 11 (a total of 4 units), the forward and backward movement of the double-track trolleys 13 & 14, and the operation of the pneumatic hoists 10 & 11 to raise one side and lower the other side A16 to achieve shaft rotation A17 through the strength ring slings S14 & S15, thereby facilitating the degreasing and cleaning of the large-diameter propeller shaft.

[0091] Step 10: Reference Figure 14 , using the double-track trolleys 13 & 14 located on the double-track I-beam H3 to assist in adjusting the height and left and right position of the propeller shaft E14 (see utility model CN201620954892.3), so as to facilitate the alignment of the propeller shaft E14 before inserting it into the stern tube bearing;

[0092] Step 11: Reference Figure 15-17 , through the compact pulley device D11 / D12 set on the end face of the stern tube and the shaft movement force anchor point D13 / D14 on the bearing stand MS4, one end of the shaft movement traction wire rope sling S18 / S19 is fixed to the flange of the propeller shaft E14, and the other end is connected to the force anchor point D13 / D14 through the shaft movement pneumatic hoist 21 / 22 after being changed in direction through the compact pulley device D11 / D12;

[0093] Step 12: Operate the pneumatic hoist 21 / 22 to pull the traction wire rope S18 / S19 A18 to achieve the movement A18 of the propeller shaft E14, completing the operation of inserting the propeller shaft E14 into the shaft tube.

[0094] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A large container ship shaft system lifting fixture, the shaft system comprising a propeller shaft, a No. 1 intermediate shaft, a No. 2 intermediate shaft, and a No. 3 intermediate shaft, wherein the propeller shaft and the No. 1 intermediate shaft are arranged in the center, and the No. 2 intermediate shaft and the No. 3 intermediate shaft are arranged on both sides, characterized in that: A single-track I-beam for shaft movement is provided in the center of the hull above each intermediate shaft, and a double-track I-beam is provided below each intermediate shaft, and a double-track trolley for shaft movement is provided on the double-track I-beam; three hand-pulled monorail trolleys are suspended below the single-track I-beam, and a lifting beam is installed below the hand-pulled monorail trolley for inserting the 1# intermediate shaft into the shaft-belt generator during subsequent operations; pneumatic hoists are provided at the lifting beams of the hand-pulled monorail trolley and the lifting points for movement of each shaft; two pneumatic hoists are provided at each lifting point on the shaft through an annular lifting belt, and a single shaft is lifted simultaneously by at least four pneumatic hoists; the propeller shaft and the lower end of the flange of the 1# intermediate shaft can be lifted by pneumatic hoists The hoist is lifted 500mm higher than the axis without affecting the illumination of the axis; after the propeller shaft and the intermediate shafts are temporarily suspended in the shaft room, the main engine can be lifted and loaded; the temporary suspension points of the propeller shaft and the intermediate shafts in the shaft room are calculated according to their stress conditions to determine the form of the structural lifting lugs and the addition of corresponding reinforcement strips; the form of the structural lifting lugs and the arrangement of the additional reinforcement strips are included in the hull structure production design drawing management before the start of section construction. If there is interference with other hull components or pipelines and circuits, coordination with relevant professionals is required before the production design drawings are issued to ensure that the lifting lugs are permanently retained as part of the hull and do not need to be cut off after the operation is completed.

2. A large container ship shaft lifting tool according to claim 1, characterized in that: The lifting capacity of the pneumatic hoist must be 1 / 4 of the axle weight.

3. The large container ship shaft lifting tool according to claim 1, characterized in that: Backup lifting points are set in places other than the lifting points of the pneumatic hoist, and special lifting straps are also set. The length of the lifting straps is calculated according to the height of the shaft suspension. When a single shaft is suspended for a long time, there are a total of 8 lifting points that bear the weight of the shaft at the same time, and the load-bearing capacity of a single lifting point is 1 / 8 of the weight of the shaft.

4. A method for lifting and installing a shaft system of a large container ship, using a large container ship shaft system lifting tool as described in any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Two high-strength circular slings of suitable lifting weight are tied equidistantly on both sides of the propeller shaft's center of gravity by threading and bundling. The slings are then hung on the hook of the dock gantry crane to lift the propeller shaft into the engine room. Step 2: A support platform and sleepers are provided on the inner bottom of the main engine platform; the propeller shaft is directed toward one end of the shaft chamber by two hand-pulled monorail trolleys with hanging beams to wrap the high-strength annular sling around the propeller shaft in the form of a bag, and while operating the dock crane to continue to descend, the pneumatic hoist (2 at each location) on the hand-pulled monorail trolley is operated to move upward so that the hand-pulled monorail trolley, hanging beam, pneumatic hoist and sling assembly begin to be stressed; until the weight of the propeller shaft is completely borne by the hand-pulled monorail trolley and the support platform; then the hook continues to descend to release the sling that binds the shaft, and then the hook moves forward to near the front flange, and the sling bag is hung around the propeller shaft to bear the stress; then the pneumatic hoist and the hook move upward at the same time to lift the propeller shaft a short distance, and then the sleepers are removed to facilitate the propeller shaft flange to pass through the support platform, and the monorail trolley and the dock crane are operated to move backward at the same time until the lifting point at the front flange can no longer move backward; Step 3: When the dock crane cannot move further backward, a high-strength ring sling is placed around the propeller shaft in a sling-like manner. Two pneumatic hoists are operated to move upward, so that the third hand-pulled monorail trolley located at the front of the monorail I-beam bears the weight of the propeller shaft through the sling beam. The hook of the dock crane then continues to descend and leaves. Step 4: Move the lifting point consisting of the middle trolley, lifting beam, pneumatic hoist (2 units in total), and high-strength ring sling forward to a position close to the center of gravity of the propeller shaft. Then, operate the three sets of hand-pulled monorail trolleys to share the weight of the propeller shaft. Then, operate the three sets of hand-pulled monorail trolleys to move backward simultaneously to above the two double-track trolleys located on the double-track I-beam. Step 5: Use pneumatic hoists (a total of 6 units) to lower the propeller shaft onto the two double-track trolleys on the double-track I-beam. The propeller shaft is moved backward to the designated position by the double-track trolleys. The remaining intermediate shafts are moved to the designated positions in the same way as described in the above steps. Step 6: Use a lifting point equipped with pneumatic hoists (a total of 4 units) to lift the 2# and 3# intermediate shafts to the specified height using a high-strength circular sling. Then, use a customized high-strength circular sling to hold the 2# and 3# intermediate shafts at the lifting point. Then, use a pneumatic hoist (a total of 4 units) to lower the 2# and 3# intermediate shafts so that the slings at the lifting point are stressed. This ensures that the slings and pneumatic hoists at the lifting point are roughly evenly stressed, increasing the safety redundancy of the lifting point. The shafts are temporarily placed at a height that ensures that the flanges are higher than the shaft system height to facilitate subsequent axis lighting operations. Step 7: Use the pneumatic hoists and slings installed at the central and port sides of the sling points and pull them in pairs to move the 2# and 3# intermediate shafts from the central position to the port and starboard positions for suspension. Then, use the slings and pneumatic hoists as in Step 6 to roughly evenly support the weight of the 2# and 3# intermediate shafts, thereby increasing the safety redundancy of the sling points. Step 8: After temporarily suspending intermediate shafts 2 and 3, move intermediate shaft 1 to the designated location according to steps 2 to 5. Use the lifting points, the pneumatic hoist on the hand-pulled monorail trolley, and the lifting straps to roughly evenly support the weight of intermediate shaft 1, increasing the safety redundancy of the lifting points. Step 9: During formal installation, use a pneumatic hoist to lift the propeller shaft upward for a short distance to release the force on the lifting point and the high-strength annular sling below, and then remove the sling; at this time, the weight of the propeller shaft is completely borne by the lifting point, pneumatic hoists (a total of 4 units) and high-strength annular sling; operate the pneumatic hoists (a total of 4 units) to lower the propeller shaft onto the double-track trolley located on the double-track I-beam, and the propeller shaft weight is completely borne by the double-track trolley, and then degrease and clean the propeller shaft surface; Step 10: Use the double-track trolley on the double-track I-beam to help adjust the propeller shaft's height and left-right position to facilitate alignment before inserting the propeller shaft into the stern tube bearing. Step 11: Using the compact pulley device installed on the end face of the stern tube and the shaft movement force anchor point on the bearing platform, fix one end of the shaft movement traction wire rope sling to the flange of the propeller shaft, and then change the direction of the other end through the compact pulley device and connect it to the force anchor point through the shaft movement pneumatic hoist; Step 12: Operate the pneumatic hoist to pull the traction wire rope to move the propeller shaft and complete the operation of inserting the propeller shaft into the shaft tube.

5. A method for hoisting and installing a shaft system of a large container ship according to claim 4, characterized in that: The degreasing and cleaning operation can utilize the up and down movement of the pneumatic hoists (a total of 4 units), the forward and backward movement of the double-track trolley, and the operation of the pneumatic hoists to raise one side and lower the other side to realize the rotation of the shaft through the strong annular sling, which is convenient for degreasing and cleaning the large-diameter propeller shaft.

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