A ship propeller hub and shaft assembly process

Abstract

The invention relates to a process for assembling a propeller hub and a shaft of a ship, which is characterized in that: a flange protection cover is arranged on the propeller hub, the flange protection cover is assembled before the propeller hub and the shaft are assembled, and after the propeller hub and the shaft are matched through a self-made long guide pin, the flange protection cover is directly pushed onto the shaft flange and locked for installation; the installation of the flange protection cover can effectively protect the connection position between the propeller hub and the shaft; in the assembly of various components, the bolt connection position is tightened using a wrench with a set torque value, and is installed in conjunction with a sealing rubber box and grease, so as to ensure the scientific nature of the bolt locking at each position.

Description

Technical Field

[0001] The invention relates to the technical field of ship propeller hub installation, and in particular to a ship propeller hub and shaft assembly process. Background Art

[0002] A propulsion unit of a marine vessel generally comprises a propeller hub and propeller blades arranged to the propeller hub. The propeller hub comprises a drive device, which may be, for example, a drive shaft, a bevel gear, a transmission or an electric or hydraulic drive.

[0003] There are many parts involved in the hub assembly process. Currently, the hub assembly is mainly done manually, which is prone to assembly errors. There are even cases where the wrong parts are taken during the assembly process. The assembly quality depends largely on the assembly level and experience of the assembly workers. At the same time, the hub assembly quality inspection process is also affected by personal subjective factors, and it is difficult to trace the source after a problem occurs. When the ship hub is assembled with the shaft, its assembly efficiency is low, and rework and insufficient assembly precision are prone to occur during the assembly process. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a ship propeller hub and shaft assembly process, which can solve the problem that when assembling a general ship propeller hub and shaft, the assembly process is disordered and the assembly surface is not effectively protected during the process of waiting for assembly.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a ship propeller hub and shaft assembly process, the innovation of which is: the specific assembly process is as follows:

[0006] S1: Assembly preparation: Perform daily inspection on the equipment and check whether all accessories are ready according to the assembly list;

[0007] S2: Adjust the rollers of the roller racks: adjust the distance between the rollers on the two roller racks, and adjust the rollers on the two roller racks to the same height from the ground;

[0008] S3: Lifting the FWD end bidirectional pipe: Lift the FWD end bidirectional pipe onto the roller frame with a sling;

[0009] S4: Hanging the AFT-end bidirectional pipe: Use a tape measure to measure the distance between the center of the FWD-end bidirectional pipe and the ground, adjust the AFT-end bidirectional pipe bracket, and hang the AFT-end bidirectional pipe on the bracket;

[0010] S5: Bidirectional pipe connection: Check whether the sealing rings of the bidirectional pipe at the FWD end and the bidirectional pipe at the AFT end have been installed; set the torque value of the torque wrench to 200NM; clamp the flat body of the AFT pipe with an F-type wrench to prevent rotation; use the torque wrench to twist the flat body of the FWD pipe, screw it into the AFT terminal thread and tighten it to the torque. When the torque reaches 200NM, the wrench will sound a prompt. At this time, turn it twice continuously, and it will sound 3 times in total to ensure that it is fully tightened;

[0011] S6: Install bolts: Count the bolts at the joints, apply glue as required, and manually pre-tighten all bolts with an Allen wrench; tighten all bolts diagonally into place according to the standard torque of bolts of corresponding specifications;

[0012] S7: Remove the sharp edge of the two-way pipe and install the copper sleeve: Check whether the sharp edge of the pipe of the propeller hub has been processed properly, and manually grind the sharp edge of the two-way pipe at the AFT end connected to the propeller hub pipe with a grinder; then install the copper sleeve sealing ring in the inner hole of the tail shaft;

[0013] S8: Bidirectional tube installation: Use two slings to lift the connected and assembled bidirectional tube, slowly insert the AFT end of the bidirectional tube from the FWD end of the shaft, and use a long wood to push the bidirectional tube out of the shaft by 150mm;

[0014] S9: Adjust the propeller hub tube length: screw the lifting ring into the piston lifting hole, and slowly pull the piston outwards so that the propeller hub tube is exposed by 76mm;

[0015] S10: Adjust the shaft flange hole position: rotate the shaft body to adjust the shaft flange hole position to an angle corresponding to the hub hole position;

[0016] S11: Assemble the flange protection cover: First, clean the flange protection cover, then lock the sealing cover with bolts at the end of the flange protection cover, and an inner sealing ring is arranged between the inner contour of the flange protection cover and the sealing cover, and the torque is 76NM; then, a hole plug is arranged on the flange protection cover; an outer sealing ring is arranged at the outer contour of the flange protection cover; finally, the outer sealing ring and the assembled flange protection cover are hoisted to one side of the flange;

[0017] S12: Installation of the hub mating surface: Freeze the four positioning pins with liquid nitrogen and assemble them into the hub mating surface with copper rods; screw two self-made long guide pins into any two threaded holes on the hub that are 180° symmetrical; assemble the hub sealing surface O-ring into the sealing groove;

[0018] S13: Connect the propeller hub and the shaft bidirectional tube: Use a crane to lift the propeller hub and move it slowly forward so that the end face of the propeller hub is close to the shaft bidirectional tube; set the torque wrench value to 200NM, use the torque wrench to flatten the tail shaft tube, screw it into the propeller hub tube thread and tighten it to the torque. When the torque reaches 200NM, the wrench will make a sound prompt. At this time, turn it twice continuously, and make a total of 3 sounds to ensure that it is fully tightened;

[0019] S14: Docking the propeller hub with the stern shaft: Continue to move the crane slowly forward to insert the self-made guide pin on the propeller hub into the corresponding hole of the stern shaft; slowly move the propeller hub with the crane until the distance between the docking surface and the stern shaft docking surface is 200-250mm, then stop; apply sealant from the outer side of the O-ring on the docking plane of the propeller hub to the largest plane; apply clear oil or white oil on the outer circle of the shaft head; start the crane to make all the flat locating pins enter the corresponding pin holes;

[0020] S15: Assemble the flange protection cover: Remove the two self-made long guide pins, stick the outer sealing ring into the sealing groove of the flange protection cover, and apply sealant to the contact surface between the flange protection cover and the shaft flange; slowly push the flange protection cover onto the shaft flange; pre-apply fixed grease to the thread heads of the four hub connecting bolts, apply sealant to the bolt flat surface, screw them in with an adjustable wrench, and pre-tighten them diagonally; finally, use a hydraulic wrench to tighten the connecting bolts diagonally until the torque reaches 2250NM;

[0021] S16: Assemble the remaining accessories: The remaining bolts are assembled by pre-tightening them diagonally. Pre-apply fixed grease to the threaded head of the hub connecting bolts, apply sealant to the bolt surface, screw them in with an adjustable wrench, and pre-tighten them diagonally. Finally, use a hydraulic wrench to tighten the connecting bolts diagonally until the torque reaches 2250NM, and make anti-loosening marks on the bolts.

[0022] The advantages of the present invention are:

[0023] 1) In the present invention, a flange protection cover is arranged on the propeller hub. Before the propeller hub and the shaft are assembled, the flange protection cover is first assembled. After the propeller hub and the shaft are matched with each other through a self-made long guide pin, the flange protection cover is directly pushed onto the shaft flange and locked for installation. The installation of the flange protection cover can effectively protect the connection position between the propeller hub and the shaft. In the assembly of each component, the bolt connection position is tightened with a wrench with a set torque value, and the installation is carried out in conjunction with a sealant box and grease to ensure the scientificity of the bolt locking at each position. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Figure 1 The present invention is a process flow chart of assembling a ship hub and shaft.

[0026] Figures 2 to 8 This is a diagram showing the assembly state of a ship's propeller hub and shaft according to the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1 to 8 A ship propeller hub and shaft assembly process is shown, and the specific assembly process is as follows:

[0030] S1: Assembly preparation: Perform daily inspection on the equipment and check whether all accessories are ready according to the assembly list;

[0031] S2: Adjust the rollers of the roller racks: adjust the distance between the rollers on the two roller racks, and adjust the rollers on the two roller racks to the same height from the ground;

[0032] S3: Lifting the FWD end bidirectional pipe: Lift the FWD end bidirectional pipe onto the roller frame with a sling;

[0033] S4: Hanging the AFT-end bidirectional pipe: Use a tape measure to measure the distance between the center of the FWD-end bidirectional pipe and the ground, adjust the AFT-end bidirectional pipe bracket, and hang the AFT-end bidirectional pipe on the bracket;

[0034] S5: Bidirectional pipe connection: Check whether the sealing rings of the bidirectional pipe at the FWD end and the bidirectional pipe at the AFT end have been installed; set the torque value of the torque wrench to 200NM; clamp the flat body of the AFT pipe with an F-type wrench to prevent rotation; use the torque wrench to twist the flat body of the FWD pipe, screw it into the AFT terminal thread and tighten it to the torque. When the torque reaches 200NM, the wrench will sound a prompt. At this time, turn it twice continuously, and it will sound 3 times in total to ensure that it is fully tightened;

[0035] S6: Install bolts: Count the bolts at the joints, apply glue as required, and manually pre-tighten all bolts with an Allen wrench; tighten all bolts diagonally into place according to the standard torque of bolts of corresponding specifications;

[0036] S7: Remove the sharp edge of the two-way pipe and install the copper sleeve: Check whether the sharp edge of the pipe of the propeller hub has been processed properly, and manually grind the sharp edge of the two-way pipe at the AFT end connected to the propeller hub pipe with a grinder; then install the copper sleeve sealing ring in the inner hole of the tail shaft;

[0037] S8: Bidirectional tube installation: Use two slings to lift the connected and assembled bidirectional tube, slowly insert the AFT end of the bidirectional tube from the FWD end of the shaft, and use a long wood to push the bidirectional tube out of the shaft by 150mm;

[0038] S9: Adjust the propeller hub tube length: screw the lifting ring into the piston lifting hole, and slowly pull the piston outwards so that the propeller hub tube is exposed by 76mm;

[0039] S10: Adjust the shaft flange hole position: rotate the shaft body to adjust the shaft flange hole position to an angle corresponding to the hub hole position;

[0040] S11: Assemble the flange protection cover: First, clean the flange protection cover, then lock the sealing cover with bolts at the end of the flange protection cover, and an inner sealing ring is arranged between the inner contour of the flange protection cover and the sealing cover, and the torque is 76NM; then, a hole plug is arranged on the flange protection cover; an outer sealing ring is arranged at the outer contour of the flange protection cover; finally, the outer sealing ring and the assembled flange protection cover are hoisted to one side of the flange;

[0041] S12: Installation of the hub mating surface: Freeze the four positioning pins with liquid nitrogen and assemble them into the hub mating surface with copper rods; screw two self-made long guide pins into any two threaded holes on the hub that are 180° symmetrical; assemble the hub sealing surface O-ring into the sealing groove;

[0042] S13: Connect the propeller hub and the shaft bidirectional tube: Use a crane to lift the propeller hub and move it slowly forward so that the end face of the propeller hub is close to the shaft bidirectional tube; set the torque wrench value to 200NM, use the torque wrench to flatten the tail shaft tube, screw it into the propeller hub tube thread and tighten it to the torque. When the torque reaches 200NM, the wrench will make a sound prompt. At this time, turn it twice continuously, and make a total of 3 sounds to ensure that it is fully tightened;

[0043] S14: Docking the propeller hub with the stern shaft: Continue to move the crane slowly forward to insert the self-made guide pin on the propeller hub into the corresponding hole of the stern shaft; slowly move the propeller hub with the crane until the distance between the docking surface and the stern shaft docking surface is 200-250mm, then stop; apply sealant from the outer side of the O-ring on the docking plane of the propeller hub to the largest plane; apply clear oil or white oil on the outer circle of the shaft head; start the crane to make all the flat locating pins enter the corresponding pin holes;

[0044] S15: Assemble the flange protection cover: Remove the two self-made long guide pins, stick the outer sealing ring into the sealing groove of the flange protection cover, and apply sealant to the contact surface between the flange protection cover and the shaft flange; slowly push the flange protection cover onto the shaft flange; pre-apply fixed grease to the thread heads of the four hub connecting bolts, apply sealant to the bolt flat surface, screw them in with an adjustable wrench, and pre-tighten them diagonally; finally, use a hydraulic wrench to tighten the connecting bolts diagonally until the torque reaches 2250NM;

[0045] S16: Assemble the remaining accessories: The remaining bolts are assembled by pre-tightening them diagonally. Pre-apply fixed grease to the threaded head of the hub connecting bolts, apply sealant to the bolt surface, screw them in with an adjustable wrench, and pre-tighten them diagonally. Finally, use a hydraulic wrench to tighten the connecting bolts diagonally until the torque reaches 2250NM, and make anti-loosening marks on the bolts.

[0046] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements shall all fall within the scope of the present invention claimed for protection.

Claims

1. A ship hub and shaft assembly process, characterized in that: The specific assembly process is as follows: S1: Assembly preparation: Perform daily inspection on the equipment and check whether all accessories are ready according to the assembly list; S2: Adjust the rollers of the roller racks: adjust the distance between the rollers on the two roller racks, and adjust the rollers on the two roller racks to the same height from the ground; S3: Lifting the FWD end bidirectional pipe: Lift the FWD end bidirectional pipe onto the roller frame with a sling; S4: Hanging the AFT-end bidirectional pipe: Use a tape measure to measure the distance between the center of the FWD-end bidirectional pipe and the ground, adjust the AFT-end bidirectional pipe bracket, and hang the AFT-end bidirectional pipe on the bracket; S5: Bidirectional pipe connection: Check whether the sealing rings of the bidirectional pipe at the FWD end and the bidirectional pipe at the AFT end have been installed; set the torque value of the torque wrench to 200NM; clamp the flat body of the AFT pipe with an F-type wrench to prevent rotation; use the torque wrench to twist the flat body of the FWD pipe, screw it into the AFT terminal thread and tighten it to the torque. When the torque reaches 200NM, the wrench will sound a prompt. At this time, turn it twice continuously, and it will sound 3 times in total to ensure that it is fully tightened; S6: Install bolts: Count the bolts at the joints, apply glue as required, and manually pre-tighten all bolts with an Allen wrench; tighten all bolts diagonally into place according to the standard torque of bolts of corresponding specifications; S7: Remove the sharp edge of the two-way pipe and install the copper sleeve: Check whether the sharp edge of the pipe of the propeller hub has been processed properly, and manually grind the sharp edge of the two-way pipe at the AFT end connected to the propeller hub pipe with a grinder; then install the copper sleeve sealing ring in the inner hole of the tail shaft; S8: Bidirectional tube installation: Use two slings to lift the connected and assembled bidirectional tube, slowly insert the AFT end of the bidirectional tube from the FWD end of the shaft, and use a long wood to push the bidirectional tube out of the shaft by 150mm; S9: Adjust the propeller hub tube length: screw the lifting ring into the piston lifting hole, and slowly pull the piston outwards so that the propeller hub tube is exposed by 76mm; S10: Adjust the shaft flange hole position: rotate the shaft body to adjust the shaft flange hole position to an angle corresponding to the hub hole position; S11: Assemble the flange protection cover: First, clean the flange protection cover, then lock the sealing cover with bolts at the end of the flange protection cover, and an inner sealing ring is arranged between the inner contour of the flange protection cover and the sealing cover, and the torque is 76NM; then, a hole plug is arranged on the flange protection cover; an outer sealing ring is arranged at the outer contour of the flange protection cover; finally, the outer sealing ring and the assembled flange protection cover are hoisted to one side of the flange; S12: Installation of the hub mating surface: Freeze the four positioning pins with liquid nitrogen and assemble them into the hub mating surface with copper rods; screw two self-made long guide pins into any two threaded holes on the hub that are 180° symmetrical; assemble the hub sealing surface O-ring into the sealing groove; S13: Connect the propeller hub and the shaft bidirectional tube: Use a crane to lift the propeller hub and move it slowly forward so that the end face of the propeller hub is close to the shaft bidirectional tube; set the torque wrench value to 200NM, use the torque wrench to flatten the tail shaft tube, screw it into the propeller hub tube thread and tighten it to the torque. When the torque reaches 200NM, the wrench will make a sound prompt. At this time, turn it twice continuously, and make a total of 3 sounds to ensure that it is fully tightened; S14: Docking the propeller hub with the stern shaft: Continue to move the crane slowly forward to insert the self-made guide pin on the propeller hub into the corresponding hole of the stern shaft; slowly move the propeller hub with the crane until the distance between the docking surface and the stern shaft docking surface is 200-250mm, then stop; apply sealant from the outer side of the O-ring on the docking plane of the propeller hub to the largest plane; apply clear oil or white oil on the outer circle of the shaft head; start the crane to make all the flat locating pins enter the corresponding pin holes; S15: Assemble the flange protection cover: Remove the two self-made long guide pins, stick the outer sealing ring into the sealing groove of the flange protection cover, and apply sealant to the contact surface between the flange protection cover and the shaft flange; slowly push the flange protection cover onto the shaft flange; pre-apply fixed grease to the thread heads of the four hub connecting bolts, apply sealant to the bolt flat surface, screw them in with an adjustable wrench, and pre-tighten them diagonally; finally, use a hydraulic wrench to tighten the connecting bolts diagonally until the torque reaches 2250NM; S16: Assemble the remaining accessories: The remaining bolts are assembled by pre-tightening them diagonally. Pre-apply fixed grease to the threaded head of the hub connecting bolts, apply sealant to the bolt surface, screw them in with an adjustable wrench, and pre-tighten them diagonally. Finally, use a hydraulic wrench to tighten the connecting bolts diagonally until the torque reaches 2250NM, and make anti-loosening marks on the bolts.

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